Check if the WiFi and Bluetooth chips are enabled: Go to Settings > About phone > Hardware information and make sure that the WiFi and Bluetooth chips are listed as enabled. Check if there are any software updates available: Go to Settings > Software...
If restarting your phone didn't do the job, one of the most common reasons notifications don't show on Android is because of the notification settings of the app in question. It's possible that you may have mistakenly messed up with the default notif...